Brandoneon01

I don’t blame you at all, we spend too much money on these trucks to drive us nuts and not genuinely enjoy them, I started a claim with GM about it, not sure that’s even worth it after hearing your experience.

Was it a like you were driving over tiny bumps in the road? And sounds like a slight rumble? I’m getting that with very light throttle around the 35-50 mph range, and low rpm’s just maintaining speed. I have a 2023 gmc Sierra and they’re telling me it’s the DFM and there’s nothing they can do, even though my 2017 GMC Sierra never did this with AFM. Wondering if I need to contact GM before I get rid of this thing and ask about the valve body

Did you ever figure out this issue? I’m having the same thing going on with my 2023 GMC Sierra

So I have a 2023 gmc Sierra 1500 elevation model with the 5.3l and 10 speed, when I just maintain speed around 40-47 miles and hour it rumbles and slightly vibrates, almost like running over little bumps. And happens in lower speeds as well. I’ve drove in L9 in which the problem leaves, so I know it has something to do with DFM. But I’ve seen other post talking about it being DFM, that was fixed with the transmission valve body being replaced. And was wondering if it was a common fix for this issue and if it’s worth bringing to the dealers attention, thanks.